RRB/SSC JE Mech: IC Engine & RAC Quiz 4

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Question 1

For a diesel cycle, the clearance ratio is 10% and cut off takes place at 5% of stroke. The efficiency of the cycle is ________ %.

• A33
• B46
• C51
• D59

Question 2

For an Otto cycle, the efficiency of the cycle is 54%. The temperature at the start of compression is 15 °C. The temperature after compression is ____ K.

• A454
• B490
• C626
• D750

Question 3

If a certain mass of moist air in an air tight vessel is heated to a higher temperature, then

• ASpecific humidity of the air increases
• BSpecific humidity of the air decreases
• CRelative humidity of the air increases
• DRelative humidity of the air decreases

Question 4

When unsaturated air is adiabatically saturated, which of the following properties decrease?
1). Dry bulb temperature
2). Wet bulb temperature
3). Relative humidity
4). Specific humidity

• A1 only
• B1 and 2 only
• C2 and 3 only
• D3 and 4 only

Question 5

In order to have a low by-pass factor of a cooling coil, the fin spacing and the number of tube rows should be

• AWide apart and high, respectively
• BWide apart and low, respectively
• CClose and high, respectively
• DClose and low, respectively

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